Caravan AWD V6-201 3.3L (1991)
Water Pump: Testing and Inspection
After Repairs Operational Check
COOLING SYSTEM OPERATIONAL CHECK
IMPORTANT: Always verify the operation of the thermostat and cooling fan prior to driving the vehicle after a cooling system repair.
HOW
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With the cooling system filled with coolant and the radiator cap installed, start the engine and allow the coolant to warm up.
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The upper radiator hose should remain cool to the touch until the coolant within the engine block and head has reached the thermostat opening
temperature.
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The thermostat opening should be indicated by a rapid warm up of the upper radiator hose.
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If upper hose gradually warms up, the thermostat may be stuck open (assuming the engine is started cold)
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If the coolant temperature reaches the normal operating temperature (as indicated by the temperature gauge) before the upper hose becomes warm,
the engine should be turned off, and the cooling system allowed to cool down. The thermostat may be stuck closed and should be removed and
tested.
WARNING: Never remove the radiator cap, or disconnect a coolant hose on a warm engine. A warm cooling system may contain a large
amount of stored energy in the form of steam and high pressure, which could seriously injure you.
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If the thermostat opened properly, continue to allow the cooling system to warm up. As the coolant temperature reaches its maximum operating
temperature the electrical cooling fan should energize. Verify the fan energizes and de-energizes.
WHY
